<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // let obj = {};
    // obj.name = '张三';
    // let key = 'name';
    //为 obj 添加 name 属性

    //通过中括号的方式添加
    // obj['name'] = '张三'
    // obj[key] = '张三';

    //内部添加
    let key = 'name';

    let obj = {
      [key]: '张三'
    };

    console.log(obj);

    // 成员访问符  
    // .
    // []

  </script>
</body>
</html>